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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1114e68990928da0dedf68cba835f46b48d920d260433c4602264eb041fe964b' 
  AND token = 'Okj1WPGFHpCYCwcgObn/h6zoZUcpKSi5qZtGt9c/fIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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