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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02a6026b3936e8127d3a22004ebd14075ebaa55fda8095983b9a1c6ba8100e3' 
  AND token = 'gT9DnRNGT2FkMa3yIcEZeiDP38K5V8Iu3BJ2ZjhWv4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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