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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb04f8628c0ebeccbafe73922349d069848feaef9f6cee236b8e6a0c83b9753' 
  AND token = 'O+H67u+56QiKQJG2l4h6wDxI3NnukP9e/XI/M+bnwYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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