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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37704257a0e072769e431a774166e5a5d70cc469ec1e0464006627ea8ba87be' 
  AND token = 'r2zkH03u/kPAGHZaRuG2oEVYLvxVu0J0QoNv1ShJ6m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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