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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14708876d8be97c7aa43ed91801f3ac93e0134050c6b025096fa2f3c1eceb065' 
  AND token = 'M2QFW1zUil91jPeM1mLlYIECTUoLmRa1sChyZjRH4FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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