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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ccdbb17507d7e50681d36dec3012300cac03053a9ddc5c4a2ee236825934c6' 
  AND token = 'w1rpPA/Q9XerMuyp0n4kFntMLkQaJScm2Km9NsXtbj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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