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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241928d11517245fdca2212afff0f36bc11e2ea40d455891725f39ca3952c7b1' 
  AND token = 'rRdKkdSX1hGgATvDKPsm2dhle8hn0dZEuD5DaPeb30I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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