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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682d52569a22b8b8ba72f587053b0098d1eb8ce60986b83e7106c530b263dbbd' 
  AND token = 'Is8lIR88T2yyel0uSiUXhTfQThXq++C+8mgjkHvabFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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