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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b25e2237ee101f8969b9cf22a1e8f54f423de5cb7b3d33eb7bc23cf73105600' 
  AND token = 'Uz/eOPz0s9GRfjvq04P7EEx38R6yICCpXl3LjX7WbHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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