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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cdfebbc71c2ba589bc435ffcc7002f59fdeab598e2a37b62c5eddfc1b6da577' 
  AND token = '1D/8BfxcfNzyLkGL7HGmbv/majZTz2mdvfxplHxn/+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}