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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064bab43f5b2e5e4db475342545bd66787db1bd2b86914c788a498b0f6017d81' 
  AND token = 'lNMr3lknkDVnWHVjEhfZ+mn+q1ei0jngED8GKcT1MUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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