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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b94ef55bf579b5790dae5d9e6703e0fba3ca3c06fffb01b0f778d78be4566c' 
  AND token = '9bymwQTT8sGnWyeJIhhnOjwDjnk2Uid5meR9xtnhFUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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