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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a708e1631a92f0d5a4a481a48a54979217c29f9a78d365bb40c7eaa0ea4c46a' 
  AND token = 'jC7MluKad4/LPBo0kg9l7NXUvVvRFYljKQJUxe411EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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