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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcd2bc8eff2480e0162dac37e89bf2cc138ac7b78b97d417e3f705391dbf93b' 
  AND token = '8zmjgsPUypXmpAKp120o9UYNeLR9xamnWDeh+dRQo7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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