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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7827045acae3b5648c7efc9dc9884400b318665c11b0102f083d0cc24ce246' 
  AND token = '1oMz5HieUTwI2PJcyCaR+yf8SyVLow8DVlSsRe/xdPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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