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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510c337f1e944710d06313c4c468af936368fdff49543078265cbdd9be32b94a' 
  AND token = '2GR0dJPBmM2MRfeeUgfK9OKG+4SH8QjlGz9CgWOF2rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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