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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d59cbea69bd1f18fd5f81a7b4e975f3979cfbef2cd9b39eec19947e632e293' 
  AND token = '7nASZP9uZtaWhIwEszVqaKkiBGne9bT77hNAswZyct4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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