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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c0353308a481405ccaebbe6b51a5dcb3b0a4fe9ab4e2e1f12f2e29893c4705' 
  AND token = 'K/oFA5Ef+ct2avrhjzkK+o70wNCwHcQaznfc8tpfFJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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