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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f554b9f4e29aae38afc07205c6e19696e11765b56f6bd1627dafc1afe2c57c7' 
  AND token = 'h09eaFSvqjdR9tToNzvAgFn5qkpmAG+nX4iFgZtR17o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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