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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcae7e80eaf13971d8d8d10ff190d775f849d9818358652f4a0175e82b9de824' 
  AND token = 'ImVD04mR8TY4drZVE+FEX8XzL9Tn8eMVsGjwXj3CU84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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