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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68ccad6b08c6246a752b26bcc1ba984691348b594b8b8dc454d3a40118ef3de' 
  AND token = '1sBWPcE8i2B/Q7NO9ax4VW7/gtlUP9iEYjK0VMm5IiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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