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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93cc82af759ee1057227866d5d933c453b0ada329b6685d22af21e21aa79fc7' 
  AND token = 'MKEfxjFQ/Ksa5ljd9dVs+YzYT0KRAKtpmAmgRl/Qb4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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