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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a823065c8d8f1665302daf720e2031e3eeefbdb00ead9b2b27e312206b87aba' 
  AND token = 'kkyNKNi4EfGvZs2PxMd5aGMjhKaFTxz9ZUrJoV90J74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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