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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30db57c51074cace6c56de7ae3a13f127ed380ab6fdf55a7d3f0ae3b868d1470' 
  AND token = 'UoJ9g5qe4ZNSeOsgr4cD+KvGwwkvfDFLGCIPhdbfS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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