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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbff019e464c61a22bc2d48e741a28f4b63656399ac2eb8fb6a41a0a7be6b874' 
  AND token = '/sdiUA7sJ8wtx3qDxA3vNrKKPSNlTyl0hstfnW7+IXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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