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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcaf25d59fff6a60470891a0fb76bdef151453b340ecc849fc29578e7a5e70f' 
  AND token = '8QKBt66h57jd6ALrztlgAnwVDQZdd2Q2/kXhOSOcymk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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