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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d7701de5d879e887dece726730083488addf0a5145a3c67b709fcc7f2c0d01' 
  AND token = 'w93rqba7zFEzruobDMz2SWMWKgKBAVlrLrD1MIA1fhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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