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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d58619815da85a16d046cd85b942625af7c0e8b88b38c0b2b6572e6a217d96' 
  AND token = '0yGkMX7E+Hz+CguY2rLQWs9TJR1JE33wsEXtgjuSoIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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