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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392bab9bfeaa2ad3fccaaf766dd74914341ce1d54aa18e019c1ea2e3ce71d9c5' 
  AND token = 'qkNUi4HzydKhQBWF94Pc8Y+DqJ2vWHMjwuLm2QW7vuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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