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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f556a9af75989c6ad9480a4fc9d862797dc000020f54c50b7e4fd6f3a528eef7' 
  AND token = '2pVneJKh7+nOwu/5VX/SU6ist717EchaU+Q2goD/4RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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