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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36692342dd24e242b326176b68225371d9329740e00e032e5102e3045b72e7e' 
  AND token = '6M6ZN0ihOB5tmi1LlyrqbfC6pNpCin9hX5YCFojvShw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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