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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92840aebbe2c0bcf9d4a5b057fa54e68fbc6d92e80b856ffd2db29bb00f0d82b' 
  AND token = 'qI23F6nW/QZkzpS016CVF0tjfaQB1rm7xDib4ngC8To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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