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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cabff821e3722e7b0689593d66ff729992f2694d40216410c2443e896b8dd0' 
  AND token = 'A/GZXS88Gvbk/6thxfwi8DMyIqDnOjckg1S/TlO/Oug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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