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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5365593dbbb2d09a7664ccaad04fef8989a7eb59a38197ca33502ef2c76e5730' 
  AND token = '8qsWpc+opU+jY4DddQ8T36fVM+vk03Tisdpxfi31XSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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