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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e4bf4cad35488d5ba5702dd08dccd0dfd0f145526e265cbbab35f70f58fa10' 
  AND token = 'GTAlRcJPt09JBf+gF/iLVtzNLd9gkTbqvDByAosbno4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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