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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ae1f53ef20ee881243f54f03c55e643d18b661028ac4d7f9c5e6f0c1949d86' 
  AND token = 'dWH/ZyBbUlrq8ZE8PVNH92YINJKFiY9LtYSFK/30p+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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