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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bf198fde727c1b28285415532b5820c0971d404f94a0310f562e8426f4fd1d' 
  AND token = 'Qn6PKtWcqlAfUnPt8rWKmIzPakod/zhd24hofL1tKtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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