SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203e23785a1d754fd18ff82c0464916e77d9738688b058855950d0d16cd266b5' 
  AND token = 'G/FDzXcXfhAFnrm8diQkb+YDwJLKwNl40s5vHAm+qyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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