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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5b1ca3f091a0f80330e9df0883a7cfe895068b2df7502d74140e759966f30e' 
  AND token = '0ka28vuzZK+Z+vvLoStOc2/bVysrBsnTpzNcqu0tzfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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