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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c2f4208fd5a6eed3959f1874656aa5924151da3418bdca4c29a68914aed0e9' 
  AND token = 'ssu8+dyLLMaYCbq+WWNrlfXDmipIDBcy8drciW7zYMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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