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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c0511597d589ea7b6a1cb23a5ed0ac8970aba66b3288c9300c4c151fe6db49' 
  AND token = 'q5j1ZvSof1dkQnEqe4/GcO6Je9zr4O+hn4KvECRUhiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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