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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5c10997f234b1da6c43db11efe68e3091f879e9736c458f436e0c8ffea62d6' 
  AND token = 'mqWW0jbookdc6JoEMpk/LZVUmS0yHyG1mVxUlxfu5XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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