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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e472597559ec6fdde2b21065b85e6de526e90d2c79aa20fb5318944c93c6f9' 
  AND token = '548JKcETBS7d5hEKjIoKZv4uUFSvJoHJXymZVDarx3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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