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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff1be28e4f5cfa366396c2b9d9d5b71e5730ab26fca1c5bb9aecec4c98ca0dc' 
  AND token = '5MEcjruwxoVapwgzSi0xeKBVhyRaB4HyaJiLa3SqGsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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