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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b9f61139c356f52e51678fa56cc73d6982df8ebd34941ac4f405771c55e6ce' 
  AND token = '/C2nFszHptyvCffRuPxA26dfoAO2Kk/Q9l6HUKsti6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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