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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c5dd16ffc2234e4e2cc751f7a96d93eb5785ae2814ccd8a1c40c0ded34b13c' 
  AND token = 'Ydx9JUAn09q0NcZw8JmYcAeUOCgKEUjPGHcWzN+j238=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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