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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9302bbda86a97a108d76579e25fdf07ae5fe16b7bd13de4be313b12492f5b16a' 
  AND token = 'JPyZ49VUSbJqpV4IwZSr9+VhO6boJ8worGYn9lOAcuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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