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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10340a846f1c848eba5d48705c49acc0d1aa7567ead2373f020f5f8cf566ae31' 
  AND token = 'Smq5DGrudfi5eitT/UJzho2+M3+SpheDUFraFg8Ye2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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