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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2862cc9ecc2c51cb264d1b64af884c8acb2d3b7d069bbfc4caebb47c14d7079d' 
  AND token = 'bL00uxJ+Z9aydSjXnbIE7C6/cA8qRBlosnYuKy+43L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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