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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd6c7a66e131d7680fe4e5285354e09977f5bebfd35f3c1f98ba8d7aa0ae1c9' 
  AND token = 'P6SW7XmD95U8f37+qyeeHy7oxuc/uNZUOWwwJxYP5ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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