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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f4b1ad9728286af97bd85b5caefb35fa5c5bfb940e9789aa244f58c400484c' 
  AND token = 'T10hDrXq0O8fCrr4KA1GLSDkl3KDrNFHsTaBhxsQ/Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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