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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fdead8761a96bbf6f5326bd8f0ec03f1be66df671155bca80291088999cc7a' 
  AND token = 'LJotfpnNkSok9VtjZ/1s//vAW+dEEiC/fr7+Djr/B4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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