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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3472e35582d007df6c41b892968265a333f7ef7db0f6ea76221951d7ab8e07' 
  AND token = 'nGX1bt0Taw+uYp6fjRXKFODfjSjc8xjA6FuLfOa6gNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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