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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd05ebac06b6e8a15e9c38b1916966b9e11e457510e9ca92cc3c19a8654d0832' 
  AND token = 'kAdycrrmwI5kZVgjnnOYo37SO+nkITKl09LU/CUhNDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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