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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acbd110641c06d671b766e506b53559f5c2edd78c4f05fdd8f7b4333733745e' 
  AND token = '0YeXugGKLKovFKvHKIql6AnuWbzYMzkLpyc+iqoD2u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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